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(No Model.) 2 Sheets-Sheet 1. J. B. WARING & H. R. GASSEL.

GENTRIFUGAL FILTER.

.No. 568,821. Patented Oct. 6, 1896.

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(No Model.) 2 Sheets-Sheet 2. J. B. WARING 8v H. R. OASSEL.

GENTRIFUGAL FILTER.

Patented Oct. 6, 1896. i

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NITED STATES PATENT Fries.

JOHN B. WARING, OF NEWARK, NEWV JERSEY, AND HENRY R. OASSEL, OF

NElV YORK, N. Y.

CENTRIFUGAL FILTER.

SPECIFICATION forming part of Letters Patent No. 568,821, dated October 6, 1896.

Application filed November 25, 1895. Serial No. 569,978. (No model.)

To aZZ whom it may concern: of course be substituted. The clotheis placed Be it known that we, JOHN B. WARING, of between retaining-flanges in front of the up- Newark, Essex county, New Jersey, and right sections (Z and is backed by a screen HENRY R. OASSEL, of New York city, New or perforated sheet of metal 6. Back of the 5 York, have invented an Improved Centrifuscreen 6 there is placed a corrugated strip of gal Filter, of which the following is a specimetal 6 the inner edges of which serve as fication. supports for the filtering body,while the outer This invention relates to a centrifugal filter edges are perforated, as at 6 for the escape of which is so constructed that the filtrate is the filtrate. This filtrate passesfromthe per- 1o quickly and completely separated from the forationsc into an annularchamberd ,for1ned solid residue by a continuous process. The by inclining the inner faces of the upright filter is particularly adapted for effecting the sections d and thence escapes through the extraction of metals in solution from their perforations d of the vessel d. Above each ores by lixiviation processes, but it may be row of perforations d the vessel (Z is sur- 15 employed in other arts where a rapid and rounded by astationarydeflector f, that conthorough filtering operation is desired. ducts the filtrate into oneof a series of cham- In the accompanying drawings, Figure 1. is hers f, having an inclined bottom f and disan elevation, partly in section, of a centrifugal charging it into one of a number of receiving filter embodying our invention. Fig. 2 is a vessels f In this way the filtrate obtained 2o horizontal section of part thereof on line 2 2, from each of the steps of the vessel (1 is sep- Fig. 1, and drawn on an enlarged scale. Fig. arately collected. The filtering-rings are ar- 3 is a vertical section through the filtering ranged in steps to correspond to the steps of body on line 3 3, Fig. 2 Fig. 4, an elevavessel (1, each ring being smaller in diameter tion of the differential gear, and Fig. 5 is a than the ring next above. 25 perspective view of the scraper. The hollow shaft 1) is surrounded by a sec- The letter a represents the stationary base 0nd hollow shaft 9, provided at its lower end of the filter, in which is stepped a revoluble with a flange g and free to revolve indespindle I), that carries a collar or bottom b pendently of shaft 17 upon the upper edge of provided with lateral discharge-orifices li and the collar 19 To the shaft 9 there is keyed 8o 30 a deflector b above the same. To the collar Within each of the steps of the vessel d a hub 12 there is attached a central hollow shaft 12, h, provided with three (more or less) radial communicating with a hopper b and driven arms h. The arms of each hub are placed by a suitable pulley c. The filtering Vessel slightly above one another, Fig. 5, so that d is attached to the collar 19 and is thus rein this Way such arms traverse vertically the 3 5 volved by the pulley c. This vessel is prospace inclosed by one of the steps of the vesvided with interior steps, each step consistsel d. To the outer forked ends of the arms ing of an inclined annular base 61 and of an 77. are attached the inclined scrapers 7L2, which upright or substantially upright perforated revolve in close proximity to the filteringsection (1 The steps are so formed that each cloth 6. The shaft 9 is of such a diameter 0 40 step is smaller in diameter than the step next with relation to the shaft b that a waterway above, and in this way the entire vessel d, or conduit g is formed between the shafts. considered as a whole, widens from the bot- This conduit is provided with the inlet or tom upward. feed pipe 9 and communicates at its lower We have shown the vessel (Z to be provided end with the interior of vessel d by means of 5 5 with three steps, but the number of these the discharge-tubesg Thesetubes areprefsteps may be increased or diminished, and in erably connected to some of the radial arms some cases a single step may be found sufh, which are made hollow, and in turn comficient. municate with the conduit g by a groove 72.3

The filtering body or ring e is preferably of the hub and a perforation in the hollow 50 composed of a sheet of asbestos cloth, but shaft g, Fig. 2.

' other percolating or filtering substances may The shaft 9 has, preferably, its separate power-pulley g, and should be driven at a slightly quicker or slower motion than the shaft 1) and the vessel (Z. The object of this dilferential motion is to cause the scrapers to slowly traverse the vessel d horizontally, and to thus gradually raise the ore or other solid matter from step to step. In this way not only clogging of the filtering body is prevented, but the solid matter is made to pass successively through the various steps of the vessel, so as to be presented successively to the filtering material of each step. To this part of our invention we attach considerable importance, as it permits a continuous and automatic operation of the machine and prevents clogging of the filtering body.

The shafts b 9 should be driven at a fixed ratit to each other, and in order to render such ratio permanent or unvarying we connect: the saute by a differential gearing, which is more fully shown in Fig. 4. This gearing consists of the wheels h h, keyed to the shafts l) g, respectively, and engaging a common idler 71. hung in a fixed support lbs. The wheels h h are differently meshed, one having a slightly greater number of teeth than the other, and in this way one shaft will be caused to revolve slightly quicker than the other.

The operation of the machine when used for the extraction of dissolved metals from ores is as follows: Rotary motion being imparted to the machine, the ore and solution to be separated therefrom are fed through the hopper 11 into the hollow shaft 1). The mixture will by the centrifugal action be thrown out of the openings b and be guided by the deflector 1)" against the inner wall of the vessel (Z Here the mixture will rise to the first filtering periphery, where the first or strongest filtrate is separated and collected in one of the receptacles The residue or gangtte is by the inclined scrapers 72f slowly drawn along the filtering periphery to prevent clogging. At the same time the inclined scrapers will cause the residue to rise slowly, so as to pass from the first step of the vessel (Z into the second step. Here the filtering operation is repeated, and a weaker filtrate is separated and collected in a second vessel 1". From the second step the residue passes into the third or any additional number of steps, where still weaker filtrates are obtained. Thus by usingthe proper number of steps all or practically all the liquid is separated from the solid. The latter is finally discharged over the rim of vessel d and guided toward a dump by a deflector i.

If the ore is to be washed during the filtering operation, water is admitted by means of the pipe 9 and ejected through the pipes into the vessel (1.

It will be seen that by our invention a rapid and thorough filtration by a continuous process is effected, and that the filtrates may be automatically separated according to their strength. i

What we claim is- 1. A centrifugal filter composed of a rotat' ing vessel having perforated steps, filtering bodies secured within the steps, a feed-pipe opening at the bottom of the vessel, a surrounding hollow shaft, radial arms secured to the shaft, and scrapers secured to the arms, substantially as specified.

2. A centrifugal filter composed of a rotating vessel having perforated steps, filtering bodies secured within the steps, a central feedpipe opening at the bottom of the vessel, a hollow shaftsurroun ding the feed-pipe and fortning a water-conduit around the same, radial arms connected to the hollow shaft, dischargetubes commnnicatingwith the water-conduit, and inclined scrapers secured to the radial arnts, substantially as specified.

A centrifugal filter composed of a rotating vessel having perforated steps, filtering bodies seen red within the steps, a central feedpipe opening at the bottom ofthe vessel, a surrounding hollow shaft, radial arms secured to the shaft, inclined scrapers carried thereby, a series of collecting-chambers surrounding the vessel and communicating respectively with the perforated steps, and a series of receiving vessels comm unicating with the collecting-ehambers, substantially as specified.

J. 13. WARING. HENRY It. CASSEL. \Vitnesses:

F. v. BRIESEN, FREDERICK SEIBEL. 

